From patchwork Sat Apr 23 15:24:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Geis X-Patchwork-Id: 12824609 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18B7AC4332F for ; Sat, 23 Apr 2022 15:24:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233399AbiDWP1K (ORCPT ); Sat, 23 Apr 2022 11:27:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233329AbiDWP1H (ORCPT ); Sat, 23 Apr 2022 11:27:07 -0400 Received: from mail-qt1-x829.google.com (mail-qt1-x829.google.com [IPv6:2607:f8b0:4864:20::829]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B159734B98; Sat, 23 Apr 2022 08:24:10 -0700 (PDT) Received: by mail-qt1-x829.google.com with SMTP id d9so7542489qty.12; Sat, 23 Apr 2022 08:24:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=rU0TJJku8+YENusDzm4l45KX4x5KwoK0t+MJowhYnC8=; b=VhIL0BFeAIoyBNQoDbCkYQDVSKWPAq63XnGyZExo4QeUAVQYKYhRFuDUrPVLJ8LSZJ Z0zy9KjcYwJu7FkVNa7lyZyqVhMXyeRHwJExNxxE75SpTNAumJEru3RVn6Ppk5ctjJ1j WWtlmeggmhiB4ZNSvH5K51kFedIdy0wFPLXv5HAyUq8GYNvpocWqHGGoIff4qCqWgDNn CYVL465diUUsCxnq9f1ui0mwhmJ08fPzXlLxyTPUqBlBrKo3uKTJwpmrRye0B5grOn1M woTBPrLtnJ+HP9YynTh2EDJvpPpiCIFapYXU06enq3XIJtvCE72JQuFwO5KM//C2kuxd R9Rw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=rU0TJJku8+YENusDzm4l45KX4x5KwoK0t+MJowhYnC8=; b=o69CKZ49CnN8qNa9XejFdI2U62xU0oYbbfewlJdceXcvKdjB0RVGJy6JQ2QzQ7PLBW SzF8cDt3enkCd/7f5ee06JPt3DVfYPihUifVHseGDzAJ5qiG3EPxeKFrAAWG33c2Bikn rA6RqQwHmhiOtkBvgLWfds9CLq/LHhwkNAsBww6MWJr3YL3nvilbV44pDQK+SVZWwDFI hh0KsznHEdw9qC8LNcOIBxtr/xmTdFl5OQJnUTL/THb/fklJKIcO4xNsIpVDM29z1+gv yC7CoITgywcnaIAnf8VYEaJGGZ/8aC0L7ILMLBUXRxz6G43hlhKRdiqrLgQIAaiIEeVu 1stQ== X-Gm-Message-State: AOAM5301BGvNNzsSONAHUf+YJ7E07Wf0fOUJNJUUvwdAsBqgADJbFa8l fEM9LTLpdJsZXOTkH07HS5lc7EAmJjXaKw== X-Google-Smtp-Source: ABdhPJxSACknhS4BS8uZnPnHXXRH3m70HA1DfFwJtQR5X4zDul3MOBemOAWhZrDurCSAYqDgPWELTA== X-Received: by 2002:a05:622a:1706:b0:2f1:f945:1c39 with SMTP id h6-20020a05622a170600b002f1f9451c39mr6812261qtk.417.1650727449823; Sat, 23 Apr 2022 08:24:09 -0700 (PDT) Received: from master-x64.sparksnet ([2601:153:980:85b1::10]) by smtp.gmail.com with ESMTPSA id y6-20020a05622a004600b002f33ba280cbsm3184165qtw.8.2022.04.23.08.24.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 Apr 2022 08:24:09 -0700 (PDT) From: Peter Geis To: Lorenzo Pieralisi , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas , Heiko Stuebner Cc: linux-rockchip@lists.infradead.org, Peter Geis , Marc Zyngier , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 3/5] PCI: dwc: rockchip: add legacy interrupt support Date: Sat, 23 Apr 2022 11:24:01 -0400 Message-Id: <20220423152403.1681222-4-pgwipeout@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220423152403.1681222-1-pgwipeout@gmail.com> References: <20220423152403.1681222-1-pgwipeout@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The legacy interrupts on the rk356x pcie controller are handled by a single muxed interrupt. Add irq domain support to the pcie-dw-rockchip driver to support the virtual domain. Signed-off-by: Peter Geis --- drivers/pci/controller/dwc/pcie-dw-rockchip.c | 94 ++++++++++++++++++- 1 file changed, 91 insertions(+), 3 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c index d67ed811e752..b00832d653ea 100644 --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c @@ -10,9 +10,12 @@ #include #include +#include +#include #include #include #include +#include #include #include #include @@ -26,6 +29,7 @@ */ #define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val)) #define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val) +#define HIWORD_DISABLE_BIT(val) HIWORD_UPDATE(val, ~val) #define to_rockchip_pcie(x) dev_get_drvdata((x)->dev) @@ -36,10 +40,12 @@ #define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP) #define PCIE_L0S_ENTRY 0x11 #define PCIE_CLIENT_GENERAL_CONTROL 0x0 +#define PCIE_CLIENT_INTR_STATUS_LEGACY 0x8 +#define PCIE_CLIENT_INTR_MASK_LEGACY 0x1c #define PCIE_CLIENT_GENERAL_DEBUG 0x104 -#define PCIE_CLIENT_HOT_RESET_CTRL 0x180 +#define PCIE_CLIENT_HOT_RESET_CTRL 0x180 #define PCIE_CLIENT_LTSSM_STATUS 0x300 -#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4) +#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4) #define PCIE_LTSSM_STATUS_MASK GENMASK(5, 0) struct rockchip_pcie { @@ -51,6 +57,7 @@ struct rockchip_pcie { struct reset_control *rst; struct gpio_desc *rst_gpio; struct regulator *vpcie3v3; + struct irq_domain *irq_domain; }; static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip, @@ -65,6 +72,76 @@ static void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip, writel_relaxed(val, rockchip->apb_base + reg); } +static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc); + unsigned long reg, hwirq; + + chained_irq_enter(chip, desc); + + reg = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_INTR_STATUS_LEGACY); + + for_each_set_bit(hwirq, ®, 4) + generic_handle_domain_irq(rockchip->irq_domain, hwirq); + + chained_irq_exit(chip, desc); +} + +static void rockchip_intx_mask(struct irq_data *data) +{ + rockchip_pcie_writel_apb(irq_data_get_irq_chip_data(data), HIWORD_UPDATE_BIT(BIT(data->hwirq)), + PCIE_CLIENT_INTR_MASK_LEGACY); +}; + +static void rockchip_intx_unmask(struct irq_data *data) +{ + rockchip_pcie_writel_apb(irq_data_get_irq_chip_data(data), HIWORD_DISABLE_BIT(BIT(data->hwirq)), + PCIE_CLIENT_INTR_MASK_LEGACY); +}; + +static struct irq_chip rockchip_intx_irq_chip = { + .name = "INTx", + .irq_mask = rockchip_intx_mask, + .irq_unmask = rockchip_intx_unmask, + .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND, +}; + +static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &rockchip_intx_irq_chip, handle_level_irq); + irq_set_chip_data(irq, domain->host_data); + + return 0; +} + +static const struct irq_domain_ops intx_domain_ops = { + .map = rockchip_pcie_intx_map, +}; + +static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip) +{ + struct device *dev = rockchip->pci.dev; + struct device_node *intc; + + intc = of_get_child_by_name(dev->of_node, "legacy-interrupt-controller"); + if (!intc) { + dev_err(dev, "missing child interrupt-controller node\n"); + return -EINVAL; + } + + rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX, + &intx_domain_ops, rockchip); + of_node_put(intc); + if (!rockchip->irq_domain) { + dev_err(dev, "failed to get a INTx IRQ domain\n"); + return -EINVAL; + } + + return 0; +} + static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip) { rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM, @@ -111,7 +188,19 @@ static int rockchip_pcie_host_init(struct pcie_port *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct rockchip_pcie *rockchip = to_rockchip_pcie(pci); + struct device *dev = rockchip->pci.dev; u32 val = HIWORD_UPDATE_BIT(PCIE_LTSSM_ENABLE_ENHANCE); + int irq, ret; + + irq = of_irq_get_byname(dev->of_node, "legacy"); + if (irq < 0) + return irq; + + ret = rockchip_pcie_init_irq_domain(rockchip); + if (ret < 0) + dev_err(dev, "failed to init irq domain\n"); + + irq_set_chained_handler_and_data(irq, rockchip_pcie_legacy_int_handler, rockchip); /* LTSSM enable control mode */ rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL); @@ -158,7 +247,6 @@ static int rockchip_pcie_resource_get(struct platform_device *pdev, "failed to get reset lines\n"); return reset_control_assert(rockchip->rst); - } static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)